2105352

Appears in sequences

• Numbers whose square can be expressed as the sum of two positive cubes in more than one way.at n=5A051302
• Numbers n such that n^2 can be expressed as the sum of 2 positive cubes in exactly 2 different ways.at n=5A145553
• Let the n-th Carmichael number A002997(n) = p1*p2*...*pr, where p1 < p2 < ... < pr are primes. Then a(n) = (p1-1) * (p1*p2*...*pr - 1)^(r-2) / ((p2-1)*...*(pr-1)).at n=10A180044